Re: STP Root port Eligibility

From: Joe Astorino (joe_astorino@comcast.net)
Date: Thu Mar 26 2009 - 13:52:16 ART

I don't know about this solution Bryan. Doesn't root guard basically just say "nobody else can be the root SWITCH, and if anybody tries I will shut down their port!". So, if the root switch is the way it is now, and we apply root guard to it's downlinks, then the non-root switches will still need a root PORT -- which will be the port with the lowest path cost to the root switch.

"He not busy being born is busy dying" -- Dylan

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----- Original Message -----
From: "Bryan Bartik" <bbartik@ipexpert.com>
To: "oluwaseyi ojo" <sameoj@gmail.com>
Cc: "ftt" <femi0802@googlemail.com>, ccielab@groupstudy.com
Sent: Thursday, March 26, 2009 12:34:55 PM GMT -05:00 US/Canada Eastern
Subject: Re: STP Root port Eligibility

Lowering the speed still allows the port to be root port if it is the only
path. To prevent it "from ever being eligible to become a root port" you
need to use root guard. Or shut it down :)

On Thu, Mar 26, 2009 at 10:27 AM, oluwaseyi ojo <sameoj@gmail.com> wrote:

> Give that port a lower speed `cause the lower the speed the higher the cost
> path. In STP, STP will choose a lowest cost path to the root bridge as the
> root port.
>
> Cheers.
>
> On 3/26/09, ftt <femi0802@googlemail.com> wrote:
> >
> > Experts,
> >
> > How can you stop a switchport from ever being eligible to become a root
> > port
> > ?
> >
> > Regards
> >
> > FTT
> >
> >
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> >
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-- 
Bryan Bartik 
CCIE #23707, CCNP 
Sr. Support Engineer - IPexpert, Inc. 
URL: http://www.IPexpert.com 

Blogs and organic groups at http://www.ccie.net

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